Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a29c978312723a27…

MALICIOUS

Office (OLE)

350.5 KB Created: 2020-07-13 11:03:58 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: 55e3077c1defd80d0a1869c1dea057a4 SHA-1: 8fd575ae70510e7cd7cc585b81ec97aad46b3f0b SHA-256: a29c978312723a2743f2175f124bbc6d1106e9050dbe2b6820e58a1aba70518c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel 4.0 macro sheet that is encrypted, indicating obfuscation of its malicious intent. ClamAV detection as 'Xls.Dropper.Agent' suggests it functions as a dropper for other malware. The presence of an 'AUTOOPEN' macro further supports its role in automatically executing malicious code upon opening.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8842569-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8842569-0
  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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